We just crossed a huge milestone -- half a million signatures on our petition calling for an independent investigation into Donald Trump's ties to Russia.

We're sending a message to the Trump administration loud and clear: we won't stand for Donald Trump's corruption, and we won't back down until we get the truth.

According to our records for this email address, it doesn't look like we have your signature on file yet. Make sure Trump and the GOP know you'll hold them accountable. Click below and sign on right now:

There's no question about why Trump did it -- this was a transparent attempt to undermine the investigation into the Trump campaign's collusion with Russia to swing the election in Trump's favor. It was done at Trump's personal direction together with an attorney general who has already had to remove himself from anything having to do with the Russia investigation.

This is not the first time Trump has fired a Justice Department official who posed a threat to him. He fired Sally Yates when she refused to enforce a Muslim ban which she knew to be unconstitutional. He fired U.S. Attorney Preet Bharara right after Bharara's office received a request to investigate Trump's conflicts of interest.

The only other President in American history to fire the official investigating him was Richard Nixon. Just like Nixon, Donald Trump must be held responsible.

Right now, that means there must be an independent investigation led by a special prosecutor. Add your name to join the call for one today: